3s are pretty tough right now for boxing because of the CC fest. You'll have some success if you beat them to the punch ( setup a CC chain including hex and shears and capacitor totems ). That said, fully expect one of your toons to be locked down the entire match.

If you can manage to get your kill target to LoS their healer, a well placed earthbind + capacitor + hex could lock the healer out long enough to secure the kill.